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Saturday, May 24, 2008

Understanding Sulphurs

Since I spend the majority of my time fishing on East Tennessee tailwaters, the primary summer hatch I experience are sulphurs. In order to have greater success when fishing sulphur hatches I feel that a deeper understanding of the insect is necessary. So for my own benefit I did some research.

Sulphur hatches are common on the South Holston tailwater from late April thru October and on the Clinch tailwater in May and June. Two species of mayfly are typically lumped together as sulphurs, Ephemerella Dorothea and Ephemerella Invaria.

Ephemerella Dorothea typically hatch when the water is between 60 and 65 degrees and are around a size 16 to 18. Nymphs are commonly found in slower currents and pools, and can ocassionally be found in shallow riffles and are best imitated using pheasant tail and split case nymphs. They emerge in slow pools and tend to congregate in eddies. Emergence takes place just below the surface film and can be imitated using various CDC wing emerging patterns. After emerging from the nymphal shuck the dries drift for an extended period waiting for their large wings to dry. Dries are best imitated with deer hair or CDC wing comparaduns. Adding a bright red head to your fly can help to imitate the big red eyes found on this species. Sometimes the trout can become selective and feed only on the females that have a little green egg-sac on the rear. To date I have only fished one spinner fall, and was not very successful in matching the pattern. The photos at right are of specimens caught on the Clinch River.

Ephemerella Invaria typically hatch when the water is between 52 and 60 degrees and are usually found in slight faster flowing water than their Dorothea cousins. Invaria is also slightly larger than Dorothea at a size 14 to 16 and lack the bright red eyes. Fly patterns for both are similar with exception to the red head on the duns. The spinner is a darker color than the dun and patterns should be chosen accordingly.

Color variation is another issue. The specimens I have found on the South Holston and Clinch vary slightly in the depth of yellow color. South Holston duns appear to be more of a creamy yellow color and Clinch river duns are more of a mix between orange and yellow.

Information for this piece has been compiled from the following websites:

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An engineer by day, you will find me at my desk or at home dreaming about my next fishing adventure. My favorite method of pursuing the various species that inhabit my East TN waters is with a fly rod, but I can be found flinging hardware with a baitcast or spinning reel. I began flyfishing around 1995 at an age of 15, and learn something new each trip. I enjoy the time outdoors with friends and family, and I especially value the time I have with my wife and kids fishing and camping. My job can be a hectic one, and I have found that the most effective escape I have from the stress is to pick up a rod and disappear for a while. I have two wonderful kids who enjoy being outdoors with daddy whether it be hiking, hunting, fishing, or whatever journey we are on at the time. I look forward to taking both of my kids fishing and hunting, and trying to be as good of a father to them as my dad was to me. This blog is my attempt at documenting the various experiences we have, and to record them for my kids as they grown older. God Bless and Tight Lines.